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Better error checking when opening the stream.

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This commit is contained in:
Felix Geyer 2010-09-16 18:20:22 +02:00
parent d508c2dd68
commit 49d64d8162
1 changed files with 28 additions and 11 deletions
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39
src/streams/LayeredStream.cpp
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@ -36,23 +36,40 @@ QString LayeredStream::errorString() const
bool LayeredStream::open(QIODevice::OpenMode mode) bool LayeredStream::open(QIODevice::OpenMode mode)
{ {
// filter out all other modes if (isOpen()) {
mode &= QIODevice::ReadWrite; qWarning("LayeredStream::open: Device is already open.");
if (mode == QIODevice::ReadWrite) {
qWarning("Reading and writing at the same time is not supported.");
return false; return false;
} }
else if (openMode() & mode) {
return true; bool readMode = (mode & QIODevice::ReadOnly);
bool writeMode = (mode & QIODevice::WriteOnly);
if (readMode && writeMode) {
qWarning("LayeredStream::open: Reading and writing at the same time is not supported.");
return false;
} }
else if (!(m_baseDevice->openMode() & mode)) { else if (!readMode && !writeMode) {
qWarning("Base device is not opened correctly."); qWarning("LayeredStream::open: Must be opened in read or write mode.");
return false;
}
else if ((readMode && !m_baseDevice->isReadable()) ||
(writeMode && !m_baseDevice->isWritable())) {
qWarning("LayeredStream::open: Base device is not opened correctly.");
return false; return false;
} }
else { else {
setOpenMode(mode | QIODevice::Unbuffered); if (mode & QIODevice::Append) {
return true; qWarning("LayeredStream::open: QIODevice::Append is not supported.");
mode = mode & ~QIODevice::Append;
}
if (mode & QIODevice::Truncate) {
qWarning("LayeredStream::open: QIODevice::Truncate is not supported.");
mode = mode & ~QIODevice::Truncate;
}
mode = mode | QIODevice::Unbuffered;
return QIODevice::open(mode);
} }
} }